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OKLAHOMA DEPARTMENT OF ENVIRONMENTAL QUALITY--AIR QUALITY DIVISION PAGE 1 of 10
Guidance
P.O. Box 1677, Oklahoma City, Oklahoma 73101-1677
PERMITTING COLLOCATED FACILITIES
Under EPA and AQD policy, emissions from sources that are located on contiguous or adjacent property may need to be aggregated in order to determine the category of permitting required; either permit exempt source (actual emissions less than 40 tpy), minor source (potential to emit less than 100 tpy), major source for Title V (actual emissions or the potential to emit greater than 100 tpy), or major stationary source (Prevention of Significant Deterioration or PSD). The purpose of this document is to explain current EPA and AQD policy and provide examples of theoretical situations and of AQD past determinations. The Guidance Sheet is a resource for the regulated community to assist them in understanding what can be a complicated issue. Any emissions source owner that has questions about the permit requirements for a particular site with collocated facilities is advised to ask the AQD for clarification. For complex situations, it may be necessary for the source owner to apply for an Applicability Determination.
I. Definitions
OAC 252:100-8-2 defines “major source”, as it pertains to Title V major source permitting and New Source Review (NSR) for PSD sources, as follows:
“Major source” means any stationary source (or any group of stationary sources that are located on one or more contiguous or adjacent properties and are under common control of the same person (or persons under common control)) belonging to a single major industrial grouping…. For the purposes of defining “major source,” a stationary source or group of stationary sources shall be considered part of a single industrial grouping if all of the pollutant emitting activities at such source or group of sources on contiguous or adjacent properties belong to the same Major Group (i.e., all have the same two-digit primary SIC code) as described in the Standard Industrial Classification Manual, 1987.
Likewise, OAC 252:100-7-1.1 defines “facility”, as it pertains to minor source permitting, as follows:
“Facility” means all of the pollutant-emitting activities that meet all the following conditions:
(A) Are under common control.
(B) Are located on one or more contiguous or adjacent properties.

OKLAHOMA DEPARTMENT OF ENVIRONMENTAL QUALITY--AIR QUALITY DIVISION PAGE 1 of 10
Guidance
P.O. Box 1677, Oklahoma City, Oklahoma 73101-1677
PERMITTING COLLOCATED FACILITIES
Under EPA and AQD policy, emissions from sources that are located on contiguous or adjacent property may need to be aggregated in order to determine the category of permitting required; either permit exempt source (actual emissions less than 40 tpy), minor source (potential to emit less than 100 tpy), major source for Title V (actual emissions or the potential to emit greater than 100 tpy), or major stationary source (Prevention of Significant Deterioration or PSD). The purpose of this document is to explain current EPA and AQD policy and provide examples of theoretical situations and of AQD past determinations. The Guidance Sheet is a resource for the regulated community to assist them in understanding what can be a complicated issue. Any emissions source owner that has questions about the permit requirements for a particular site with collocated facilities is advised to ask the AQD for clarification. For complex situations, it may be necessary for the source owner to apply for an Applicability Determination.
I. Definitions
OAC 252:100-8-2 defines “major source”, as it pertains to Title V major source permitting and New Source Review (NSR) for PSD sources, as follows:
“Major source” means any stationary source (or any group of stationary sources that are located on one or more contiguous or adjacent properties and are under common control of the same person (or persons under common control)) belonging to a single major industrial grouping…. For the purposes of defining “major source,” a stationary source or group of stationary sources shall be considered part of a single industrial grouping if all of the pollutant emitting activities at such source or group of sources on contiguous or adjacent properties belong to the same Major Group (i.e., all have the same two-digit primary SIC code) as described in the Standard Industrial Classification Manual, 1987.
Likewise, OAC 252:100-7-1.1 defines “facility”, as it pertains to minor source permitting, as follows:
“Facility” means all of the pollutant-emitting activities that meet all the following conditions:
(A) Are under common control.
(B) Are located on one or more contiguous or adjacent properties.